Quick Takeaways
- Fairmount Funds Management LLC filed SCHEDULE 13D/A for DIANTHUS THERAPEUTICS, INC. Common Stock, $0.001 par value (DNTH).
- Disclosed ownership: 4.9%.
- Date of event: 21 Nov 2025.
Fairmount Funds Management LLC - 21 Nov 2025 SCHEDULE 13D/A Report for DIANTHUS THERAPEUTICS, INC. Common Stock, $0.001 par value (DNTH)
- Filing Manager
- Fairmount Funds Management LLC
- Reporting Manager
- Fairmount Funds Management LLC
- Symbol
- DNTH
- Shares outstanding
- 43,666,020 shares
- Disclosed Ownership
- 2,139,635 shares
- Ownership
- 4.9%
- Form type
- SCHEDULE 13D/A
- Filing time
- 25 Nov 2025, 21:00:22 UTC
- Date of event
- 21 Nov 2025
- Previous filing
- 15 Sep 2025
- SEC
- View on sec.gov
Quoteable Key Fact
"Fairmount Funds Management LLC disclosed 4.9% ownership in DIANTHUS THERAPEUTICS, INC. Common Stock, $0.001 par value (DNTH) on 21 Nov 2025."
What Changed
- Previous schedule filing date: 15 Sep 2025.
- Current filing was accepted on 25 Nov 2025, 21:00.
Why This Matters
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Source Evidence
Backed by Schedule 13D/13G
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting Managers (4)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Fairmount Funds Management LLC | 4.9% | 2,139,635 | 0 | 2,139,635 | /s/ Peter Harwin | Peter Harwin, Managing Member | 0001802528 |
| Fairmount Healthcare Fund II L.P. | 4.9% | 2,139,635 | 0 | 2,139,635 | /s/ Peter Harwin | Peter Harwin, Managing Member | 0001769651 |
| Peter Evan Harwin | 4.9% | 2,139,635 | 0 | 2,139,635 | /s/ Peter Harwin | Peter Harwin | 0001663607 |
| Tomas Kiselak | 4.9% | 2,139,635 | 0 | 2,139,635 | /s/ Tomas Kiselak | Tomas Kiselak | 0001830177 |